The number needed to treat (NNT) is calculated as:

A Total patients divided by outcomes

B The inverse of the absolute risk reduction (1/ARR)

C Relative risk times prevalence

D Specificity minus sensitivity

✓ Correct Answer: Option B

NNT = 1/ARR. ARR = |event rate in control - event rate in treatment|. Lower NNT = more effective treatment. NNT of 1 = every treated patient benefits. Key metric for clinical decision-making.

💡 Why is B) the correct answer?

The correct answer to the question "The number needed to treat (NNT) is calculated as:" is Option B: The inverse of the absolute risk reduction (1/ARR).

The other options — A) Total patients divided by outcomes, C) Relative risk times prevalence, D) Specificity minus sensitivity — are incorrect for this USMLE Exam Prep question. As explained above: NNT = 1/ARR. ARR = |event rate in control - event rate in treatment|. Lower NNT = more effective treatment. NNT of 1 = every treated patient benefits. Key metric for clinical decision-making.

📚 About This USMLE Exam Prep Practice Question

This 3-level USMLE Exam Prep question from the Step 3 - Clinical Practice topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free USMLE Exam Prep practice test or use flashcards for spaced repetition review.

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The number needed to treat (NNT) is calculated as:

✓ Correct Answer: Option B

📚 About This USMLE Exam Prep Practice Question

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